X+(x-12)+(x-9)=135

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Solution for X+(x-12)+(x-9)=135 equation:


Simplifying
X + (x + -12) + (x + -9) = 135

Reorder the terms:
X + (-12 + x) + (x + -9) = 135

Remove parenthesis around (-12 + x)
X + -12 + x + (x + -9) = 135

Reorder the terms:
X + -12 + x + (-9 + x) = 135

Remove parenthesis around (-9 + x)
X + -12 + x + -9 + x = 135

Reorder the terms:
-12 + -9 + X + x + x = 135

Combine like terms: -12 + -9 = -21
-21 + X + x + x = 135

Combine like terms: x + x = 2x
-21 + X + 2x = 135

Solving
-21 + X + 2x = 135

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '21' to each side of the equation.
-21 + X + 21 + 2x = 135 + 21

Reorder the terms:
-21 + 21 + X + 2x = 135 + 21

Combine like terms: -21 + 21 = 0
0 + X + 2x = 135 + 21
X + 2x = 135 + 21

Combine like terms: 135 + 21 = 156
X + 2x = 156

Add '-2x' to each side of the equation.
X + 2x + -2x = 156 + -2x

Combine like terms: 2x + -2x = 0
X + 0 = 156 + -2x
X = 156 + -2x

Simplifying
X = 156 + -2x

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